I unlocked my 1900 xp and yes it was a total pain in the ars.
I used a shaved toothpick with a magnifying glass
I used nail polish to fill the gaps and then defogger fluid to bridge it.
If it didn't sucseed on the first attempt I woudn't have done it again.
Happily unlocked now, but I am with you, if you mess up , it's shot